Artificial stone.



molding, (leeomtive articles, tombstones, etc. moldshave a smooth or polished surface, the surfaces ITED sTArns PATENT OFFICE;

GRANT HAMMOND OF SAN FRANCISCO, CALIFORNIA, ASSIGNQR OF ONE-THIRD TOCLEVE LAND L. DAM, OF SAN FRANCISCO, CALIFORNIA, AND ONE-THIRD TO MILTON B. MILLER,

OF SUNOLGLEN, CALIFORNIA.

ARTIFICIAL STONE Specification of Letters Patent.

Patented July 23, 1907.

Application filed July. 27,1905. Serial No. 271,459.

cined and powdered, hydrochloric acid is then added totho muss forming a magnesium ehlorid; this is then i'l'iluted with water, (for this purpose either fresh or salt. water, such as sea water may be employed) I then add asmallpercentage ofsull'uric acid, I then take beach sand, crushed rock saw dust, or other suitabl material and mix it with dry calcined maguesite. Alter being tlu'u'oughly mixed I pour the di-' luted' solution on the dry mixture until it; is made of any desired consistency sullieient to be poured or' otherwise plat-ed in molds where. it is allowed to set or dry. parts thus used may he very considerably varied: Thus after hydrochloric acid has been added to the powdered euleined material, the water may be added in the proportion varying from one to five parts, with relation to the mass; the percentage ol' sulfuric acid may vary from o|'1e-t-w(,:ntieth to one-eighth (it) of the hydrochloricacid previously used; the proportion of sand or other material may vary from one to teii parts with relation to the magnesia with which it' is to be mixed. If the acid solution is not quite neutralim-d, and is hot, it will set; in a'iew minutes.

ll' neutralized or cold, it will take a longer time to set, which may boas much as two or three days. This material serves to form tiling, billiard table beds, If the in contact with the molds willpresent the same appearance.

lly taking the material before the sahd is added,

it is sutlieiently plastic to. be used as a fire-proof paint,

l have louud that. the proportions of the,

or it may form a plaster or other hard coating by being properly laid on. I am able to form a particularly valuablebuilding or like brielt or block by mixing the calcined maguesite with sea water and sand, in

the proportions of one of sand, from one-til'th (1 to onehalf of the magnesite, and suflieient seawater to moisten so that it may be easily molded. I ll-ave found that saw-dust or equivalent substances may be used in conjunction with the magnesite, either separately or mixed with the sand or crushed rock to form a p-lutioularly light building block;

It is well known that when magnesium chlorid is added to calcined magnesite in the proper proportion a basic or oxy-ehlorid of magnesium is formed. vSince magnesium ehlorid 1s a most hygroscopic salt, that is has such a tendency to collect; moisture from the .air, it is not to be wondered at that the otZy-chlorid would grow moister gather a bloom on its surface. The addition of sulfuric acid. lessens this tendency.

.When the sulfuric aeidg/ is added to, my compound I. have every reason to believe that oxy or basic sulfates of magnesium areiormed. lllugnesium sulfate is not; at all hygroscopic, in fact the hydrated salt is elllorescent. The addition of the sulfuric acid is thus a departure ,lrom the formula employing only the magnesium chlorid and magnesite calcined.

-Hiwing thus described my invention, what I clairn and desire, to secure by Lelters'Pat-ent is 1. A composition of matter consisting of powdered culcined mngnesite mlxedn'lth dilute bydrochloltie acid and sulfuric acid and afterwards molded and allowed to set.

:3. Building and like blocks eonumsed of calcined may? neslte mixed with sea water and sand. dilute b \-drochloric being afterwards hardened ln amold.

it. .\s an article ot? imlnutacture, blocks formed by aucid. and a small percentage of sulfuric acid. sald'mlxture mixture of dry calcined mag'uesit-e tirst: mixed with dilute hydrochlm-le acidluwing. a small percentage of sulfuric ucid subsequeptlyadded. and pulverized material mixed with said mass to a consistency which will set. and harden in a mold. i

in testimony whereof I have ln-reunto set. my hand in 

